From my experience with Bootstrap I can tell you the only thing you really need is the grid part of it and there are so many lightweight "frameworks" that have just that and its only 250 lines of css in the example of simple grid: https://simplegrid.io/
Everything else, buttons, modals, sliders, chords are super simple anyway you can just make them yourself or use a way more featurerich separate slider or modal framework and still be on less junk code than with using bootstrap.
tl;dr if you know html and css, you no longer need a css framework for most cases.
Everything else, buttons, modals, sliders, chords are super simple anyway you can just make them yourself or use a way more featurerich separate slider or modal framework and still be on less junk code than with using bootstrap.
tl;dr if you know html and css, you no longer need a css framework for most cases.